I think it was already suggested, so I haven't done it again, but I'll use this opportunity to state that this is my thought as well :) And at least 1 pixel border between map and edit area. Or even better, 2 pixel wide semi-transparent texture with a dark pixel on the left, and a light pixel on the right, so it will be visible in both light, and dark color schemes.

As for it being a total replacement for the scrollbar/scrollwheel one more tweak is needed Can you please let the minimap scroll past the end like it did in ST1? The scroll_past_end setting isn't honored for the minimap, only for the scrollwheel and scrollbar, and if you do click on the minimap while you're scrolled past the end, it bumps the view back up